Addison Reed was traded to the Mets in August of 2015, and since then he’s been one of the best relievers in baseball. Since joining the Mets, he has a 2.05 ERA with 156 strikeouts and just 24 walks in 142 innings. He’s been closing for the Mets lately (he has 19 saves this year) but he’ll presumably take a set-up spot behind Boston’s current closer Craig Kimbrel.

All three minor league relievers that the Red Sox gave up are in their top-30 prospects, according to MLB Pipeline. Stephen Nogosek is the highest at No. 18, and he’s been pitching in High-A ball. Jamie Callahan is at No. 23, and he’s been struggling since his promotion to Triple-A in May. Gerson Bautista has struck out 53 batters in 45.1 innings in High-A, but he’s walked 28. It’s not a major return, but the Mets couldn’t really expect one for Reed. He’s been excellent, but he’s also a rental: his contract is up at the end of the 2017 season. The Red Sox will also be paying the remainder of Reed’s contract, which Ken Rosenthal estimates to be about $2.6 million.

So the Red Sox are getting a fantastic arm in Reed, and it couldn’t come at a better time. Boston experienced a first-class bullpen implosion on Sunday when reliever Matt Barnes gave up four runs on three hits, and gave away the game to the Kansas City Royals in the process. The Red Sox’s bullpen isn’t terrible, but it definitely needs help. Reliever Heath Hembree isn’t having the year the Red Sox hoped he would, and Joe Kelly (their former set-up man) is on the disabled list. Addison Reed could be just what the Red Sox need.